JP7228244B2 - Bag-making device and packaging machine using the same - Google Patents

Description

The present invention relates to a bag making apparatus and a packaging machine using the same.

As an example of a packaging machine, a reverse pillow packaging machine has, for example, the following configuration. First, a band-shaped packaging film wound on a raw roll is continuously supplied to a bag-making machine, and is made into a cylindrical bag when passing through the bag-making machine. Further, a product conveying/supplying device is arranged on the upstream side of the bag making machine, and products conveyed from the product conveying/supplying device at predetermined intervals are supplied into the bag making machine. As a result, when the product passes through the bag-making machine, it is accommodated in the packaging film formed into a cylindrical bag at predetermined intervals, and the product is transported together with the packaging film. A center sealing device and a top sealing device are arranged along the conveying direction to seal or cut predetermined positions of the packaging film to manufacture the package.

In the reverse pillow packaging machine, the raw fabric roll is arranged in a space below the bag making machine, and the packaging film is supplied from below the bag making machine. As a result, both side edges are formed on the upper side of the packaging film that has been made into a tubular bag.

The bag making machine has a flat bottom plate and side walls extending upward from the bottom plate. This type of reverse pillow packaging machine is disclosed, for example, in Patent Document 1 and the like.

Japanese Utility Model Publication No. 53-37973

For example, if the product is a cold product such as frozen food such as frozen pizza, the cold product is moved through the bag making machine while being placed on the packaging film. In the case of frozen food, it may be very cold, and dew condensation may occur, for example, on the inner and outer bottom surfaces of the bag making machine due to the difference in temperature from the ambient atmosphere. In particular, when the packaging film is intermittently conveyed, dew condensation is likely to occur due to the cold articles temporarily stopping and remaining in the bag making machine.

When such dew condensation occurs, water droplets adhering to the inner bottom surface of the bag making machine may cause the packaging film to adhere to the inner bottom surface of the bag making machine, hindering smooth transportation. In particular, movement in the lateral direction (the width direction of the film) intersecting the conveying direction is suppressed. If it does not shift in the width direction, it is controlled to move further in the width direction. Then, when the tight contact due to the water droplets is released, the packaging film may suddenly shift laterally and come off the bag making machine.

Also, for example, a shrink film has a small film thickness, so it easily adheres to the bag making machine. As a result, the above problem becomes more conspicuous.

As described above, even if the phenomenon of the packaging film sticking to the bag-making machine due to water droplets due to condensation does not occur, for example, the packaging film may proceed downstream with the water droplets adhering thereon, and the part of the film to which the water droplets adhere may be sealed. When heated and pressurized by the device, there is a risk of seal failure.

The above-described problems are described as independent ones, and the present invention does not necessarily have to be able to solve all of the described problems, and it is sufficient if at least one of the problems can be solved. In addition, we intend to obtain the right for the configuration to solve this problem by filing a divisional application or making an amendment.

In order to solve the above-described problems, the center sealing device of the present invention provides (1) a bag-making device for use in a packaging machine for packaging products at a temperature lower than the ambient temperature, wherein a strip-shaped packaging film is formed into a tubular shape. and a jet means for blowing air to the outer bottom surface of the bag-making machine, and the inner bottom surface of the bag-making machine is provided with a linear protrusion extending from the upstream side to the downstream side, The convex portions were arranged at predetermined intervals in a direction intersecting the conveying direction, and the predetermined intervals were narrower than the width of the product.

The product passing through the bag making machine is in a state of being supported by a plurality of projections via the packaging film, and a predetermined space is secured between the product and the area where the projections are not formed on the inner bottom surface of the bag making machine. . The space is a heat insulating layer, and the low temperature of the product is transmitted to the bag making machine through the linear protrusions. As a result, the temperature of the product is less likely to be transmitted to the bag-making machine, and the temperature of the bag-making machine is lowered to prevent dew condensation. Furthermore, by blowing air onto the outer bottom surface of the bag making machine, cold air does not remain in the atmosphere around the bag making machine, and the occurrence of dew condensation is suppressed as much as possible.

(2) The convex portion may be arranged parallel to the conveying direction. By doing so, the resistance applied to the packaging film is reduced, and the packaging film can be conveyed smoothly.

(3) The convex portion may be tapered at its upper end. In this way, the area of contact with the product through the packaging film can be made smaller, and the temperature of the product can be more effectively suppressed from being transferred to the bag making machine and lowering the temperature of the bag making machine. The tapered upper end may have a pointed shape as in the embodiment, or may have a predetermined width, but it is more preferable to have a pointed shape as in the embodiment.

(4) The outer bottom surface may be provided with recesses at positions corresponding to the protrusions. In this way, the back side of the convex portion directly cooled from the product is prevented from being cooled as much as possible by the movement of the jetted air in the concave portion.

(5) The recess is preferably formed up to the upstream edge of the bag making machine. By doing so, the recess is opened on the peripheral surface of the upstream end side of the bag making machine. Then, part of the air that has moved inside the recessed portion passes through the opening and wraps around to the inner bottom surface side of the bag making machine, and advances toward the downstream side inside the bag making machine. Therefore, the occurrence of dew condensation can be suppressed more reliably.

(6) The injection means may be configured to inject air toward the upstream side. By doing so, the flow of the injected air is promoted, and stagnation is suppressed. Therefore, the atmosphere around the outer bottom surface of the bag making machine is cooled by the jetted fresh air, thereby suppressing the temperature drop of the bottom surface of the bag making machine and suppressing the occurrence of dew condensation. be able to.

(7) A packaging machine according to the present invention comprises the bag-making device according to any one of (1) to (6), a film supply device that supplies the packaging film to the bag-making machine, and the bag-making device. A product conveying/supplying device arranged on the upstream side of the device for supplying the product to the bag making machine, and both side ends of the packaging film made into a cylindrical bag arranged on the downstream side of the bag making machine It is preferable to comprise a sealing device for sealing the edge, and a top sealing device arranged downstream of the sealing device for sealing and cutting the packaging film in a direction crossing the conveying direction.

ADVANTAGE OF THE INVENTION According to this invention, generation|occurrence|production of dew condensation of a bag making machine, for example can be suppressed as much as possible. As a result, it is possible to suppress the occurrence of a situation in which water droplets are generated on the inner bottom surface of the bag making machine, and the water droplets cause the packaging film to adhere to the bag making machine, hindering smooth transportation.

1 is a front view showing a preferred embodiment of a reverse pillow packaging machine according to the present invention; FIG. 1 is a front view showing a preferred embodiment of a bag-making apparatus according to the present invention; FIG. It is the top view. It is the side view. It is a figure which shows a baseplate part, (a) is the top view, (b) is its side view, (c) is its front view, (d) is an enlarged view of the part A in (c).

Preferred embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that the present invention is not to be construed as being limited to this, and various changes, modifications, and improvements can be made based on the knowledge of those skilled in the art without departing from the scope of the present invention.

FIG. 1 shows a preferred embodiment of a reverse pillow packaging machine, which is an example of a packaging machine according to the present invention. The reverse pillow packaging machine 10 includes a packaging machine main body 11, a film supply device 12 that supplies a band-shaped packaging film to the packaging machine main body 11, and a film supply device 12 that is arranged upstream of the packaging machine main body 11. and a product conveying/supplying device 14 for supplying the product 13 at predetermined intervals. The product 13 is, for example, frozen food such as frozen pizza.

The film supply device 12 is for continuously supplying the belt-shaped packaging film 15 that serves as the packaging film for wrapping the product 13 to the packaging machine main body 11 . As the packaging film 15, a thin packaging material such as a shrink film is used. The film supply device 12 operates to intermittently convey the packaging film 15 and supply it to the packaging machine main body 11 .

The film supply device 12 connects the output of a drive motor (not shown) (motor such as a servomotor whose speed is controllable) to an original fabric roll 16 wound with a belt-shaped packaging film 15 in a roll shape. It is intermittently supplied to the packaging machine main body 11 while appropriately controlling the rotational speed of the rolls 16 . In addition, various rollers 9 (only one representative is shown in the drawing) are arranged at predetermined positions from the original roll 16 to the packaging machine main body 11, and the packaging film 15 sent out from the original roll 16 is arranged. is passed over the rollers 9 and guided to the packaging machine main body 11 through a predetermined path. The rollers 9 include a drive roller for driving the strip-shaped packaging film 15, a tension roller for applying tension, and a free roller for changing the transport direction of the strip-shaped packaging film 15 and guiding the transport. . In the present invention, it is not always necessary to link the original roll 16 with a drive motor, and a feed roller may be provided on the transport path of the packaging film to pull it out.

The product conveying/supplying device 14 is composed of, for example, a plate-shaped conveying path 17 and a conveyor device 18 arranged above the conveying path 17 . The conveyor device 18 is composed of sprockets 19 arranged in front and behind, an endless chain 20 stretched over the plurality of sprockets 19, and a plurality of pushing fingers 21 attached to the endless chain 20 at predetermined pitches. be. As a result, when the pushing finger 21 hits the rear surface of the product 13 , the product 13 also moves forward on the conveying path 17 as the pushing finger 21 moves. In addition, the product conveying/supplying device 14 may be, for example, a belt conveyor or another conveying device.

The packaging machine main body 11 includes a bag making device 25 for making a tubular bag from the supplied packaging film 15, and a bag making device 25 arranged downstream of the bag making device 25 to convey the tubular bag made packaging film 15. A belt conveyor 26, a center seal device 27 arranged above the belt conveyor 26, a top seal device 30 arranged downstream of the belt conveyor 26, and an unloading conveyor 28 arranged downstream of the top seal device 30. , and a holding belt 29 and the like arranged above the belt conveyor 26 and immediately before the top seal device 30 .

The bag making device 25 passes the belt-shaped packaging film 15 continuously supplied from the film supply device 12, thereby bringing the both side edge portions 15a of the packaging film 15 into contact with each other (polymerization) and forming them into a tubular shape. It is a bag. The bag making machine 25 of this embodiment is open at the top, and is set so that both side edge portions 15a of the packaging film 15 are positioned at the top.

Further, the products 13 sequentially supplied from the product conveying/supplying device 14 to the packaging machine main body 11 are inserted into the bag making machine 25 . As a result, the products 13 supplied to the bag-making device 25 are arranged at predetermined intervals in the packaging film 15 that has been made into a cylindrical bag. In addition, since the product 13 is enclosed in the tubular packaging film 15 in this way, the belt conveyor 26 conveys the packaging film 15 with the product 13 enclosed therein.

The center sealing device 27 seals both side edges 15a of the laminated packaging film 15. As shown in FIG. The center sealing device 27 heat-seals the packaging film 15 by heating while sandwiching the both side edges 15a of the packaging film 15 from both sides. In the illustrated example, a bar-shaped sealer 31 for preheating the both side edges 15a and a pair of left and right pressure rollers 32 for heat sealing while applying a predetermined pressure are provided. Further, the center sealing device 27 has a pair of left and right pinch rollers 33 on the upstream side of the sealer 31 . The pinch rollers 33 pinch both side edges 15a of the packaging film 15 coming into contact with each other through the bag making device 25 with a predetermined pressure, and rotate synchronously, so that the both side edges 15a and thus the packaging film 15 It is designed to give a conveying force to the

The pressure roller 32 also functions as a pinch roller. That is, since the pressure rollers 32 rotate synchronously while sandwiching both side edge portions 15a of the packaging film 15 with a predetermined pressure, the conveying force is applied to the both side edge portions 15a and thus to the packaging film 15. will give In other words, it can be said that the present embodiment employs a configuration in which pinch rollers are arranged in front of and behind the sealer 31 .

The rotational speed of the pressure roller 32 (the speed of the outer peripheral surface in contact with the film) in front of the traveling direction is set to be the same as or slightly faster than the rotational speed of the pinch roller 33 (the speed of the outer peripheral surface in contact with the film). , it is possible to pass through the sealer 31 while keeping the both side edges 15a overlapped and taut. Although the pinch rollers are arranged on both sides of the sealer 31 in this embodiment, either one of them may be used. Further, although the pressurizing roller 32 has the function of a pinch roller, it is also possible to adopt a configuration in which a pinch roller is arranged in front of the sealer in the advancing direction in addition to the pressurizing roller.

The top sealing device 30 seals and cuts the tubular packaging film 15 containing the product 13 in a direction orthogonal to the conveying direction, that is, in a transverse direction. The film portion to be sealed and cut is a predetermined position between the front and rear products 13 . This top sealing device 30 has an upper top sealer 30a and a lower top sealer 30b on the upper and lower sides of the packaging film 15. - 特許庁The upper top sealer 30a and the lower top sealer 30b have built-in heaters, and the sealing surfaces at the tips of the top sealers 30a and 30b are heated to a predetermined temperature. Further, a movable cutter blade is built in the central portion of the sealing surface of the upper top sealer 30a in the front-rear direction.

In this embodiment, the upper top sealer 30a and the lower top sealer 30b move in a predetermined trajectory while their sealing surfaces face each other and move toward and away from each other. , cut with a movable cutter blade. Therefore, the top sealing device 30 laterally seals and cuts a predetermined position (the part where the product does not exist) of the center-sealed packaging film 15 . As a result, the tip portion of the packaging film 15 (the portion containing the leading product 13) is separated from the subsequent packaging film 15, and the intermediate package 35 is manufactured. Then, this intermediate package 35 is conveyed on the unloading conveyor 28 .

A shrink tunnel 36 is arranged on the transport path of the carry-out conveyor 28 . The shrink tunnel 36 is equipped with a device for blowing hot air inside, and the inside of the tunnel becomes a high-temperature atmosphere. As a result, when the intermediate package 35 passes through the shrink tunnel 36, the packaging film 15 is thermally shrunk, and a package is manufactured in close contact with the product 13 along its outer shape.

In this embodiment, an injection device 40 for injecting air is provided in the lower space of the bag making machine 25 . The injection device 40 includes an injection device main body 41 that serves as an air supply source, such as an air compressor cylinder, a pipe 42 that guides the air injected from the injection device main body 41 to a predetermined area, and It has an injection nozzle 43 attached. The injection device 40 is not equipped with a temperature control device such as a heating device, and room temperature air is injected onto the bottom surface of the bag making device 25 without being heated. The bag making device 25 and the injection device 40 constitute a bag making device.

In this embodiment, two pipes 42 are provided, and the tip end side of the side not connected to the injection device main body 41 is arranged at predetermined positions on both left and right sides of the bottom surface of the bag making machine 25 in a direction intersecting the conveying direction. . Furthermore, the injection nozzle 43 is arranged to extend obliquely upward toward the upstream side, and the air injected from the injection port at the tip moves in the extending direction, that is, toward the upstream side. Furthermore, in this embodiment, the injection device main body 41 continuously injects air. Therefore, the jetted air flows upstream without remaining in the space below the bag making machine 25, and the atmosphere in the space below the bag making machine 25 is always replaced with fresh air.

The bag making machine 25 includes a bottom plate portion 45 and side wall portions 46 connected to the left and right sides of the bottom plate portion 45 along the conveying direction so as to stand upright. The lower end of the side wall portion 46 is provided with a connecting plate portion 47 that is bent approximately 90 degrees and extends in a direction parallel to the bottom plate portion 45 . The side wall portion 46 and the connecting plate portion 47 may be configured using, for example, an L-shaped plate obtained by bending a single plate member at appropriate positions.

Then, the side wall portion 46 is arranged, for example, in a state in which the tip portion of the connecting plate portion 47 is overlapped with the left and right side edge portions of the bottom plate portion 45 . In this embodiment, the linking plate portion 47 is positioned below the bottom plate portion 45, and the bottom plate portion 45 and the linking plate portion 47 are arranged so as to be relatively movable in a direction orthogonal to the transport direction. Further, the side wall portion 46 is configured such that its lower outer portion is connected to a slide movement mechanism 48, guided by the slide movement mechanism 48, reciprocated in a direction orthogonal to the conveying direction, and fixed at a desired position. do. For example, when the operation handle 48a of the slide movement mechanism 48 rotates forward and backward, the pair of left and right side wall portions 46 approaches or separates from each other. Then, when the operation handle 48a stops rotating, the side wall portion 46 stops and stays at that position.

As a result, the interval between the left and right side wall portions 46 can be changed and adjusted. Further, even when the space between the side wall portions 46 is maximized, the connecting plate portion 47 and the bottom plate portion 45 are set so as to maintain an overlapping state. Therefore, no matter how the interval between the side walls 46 is changed, the bottom plate portion 45 and the connecting plate portion 47 exist on the bottom surface of the bag making machine 25 .

Furthermore, the upstream ends of inclined guide members 49 arranged to extend downward and outward are connected to the upstream ends of the left and right connecting plate portions 47 . The packaging film 15 is guided by inclined guide members 49 arranged on the left and right at both left and right film portions in the width direction, and the packaging film 15 is guided so as to approach or come into contact with the inner peripheral surface of the side wall portion 46 during bag making. supplied to the vessel 25 . At this time, the central portion of the packaging film 15 in the width direction advances between the left and right inclined guide members 49, reaches the upstream edge of the bottom plate portion 45, and is folded there to follow the upper surface of the bottom plate portion 45 toward the downstream side. proceed to As a result, the belt-shaped packaging film 15 is formed into a cylindrical bag along the upper surface of the bottom plate portion 45 and the inner peripheral surfaces of the side wall portions 46 of the bag making device 25, and the side edge portions 15a of the packaging film 15 are made upward. polymerized at

Further, in this embodiment, the bottom plate portion 45 has a linear protrusion 50 extending along the conveying direction at a predetermined position on its upper surface (the inner bottom surface of the bag making machine 25) in a direction perpendicular to the conveying direction. A plurality of (four in this embodiment) are provided at predetermined intervals. The arrangement interval of each projection 50 is made narrower than the width of the product 13 . As a result, the product 13 moving in the bag making machine 25 is in line contact with the projections 50 via the packaging film 15, and in the region between the adjacent projections 50, the product 13 and thus the packaging film 15 are in contact with the bottom plate portion 45. , and a space 52 is secured between the lower side of the packaging film 15 and the upper surface of the bottom plate portion 45 . Further, the convex portion 50 has a tapered upper end and a peaked, mountain-like, substantially triangular shape, so that the area of contact with the product 13 through the packaging film 15 is extremely small.

Thus, even if the product 13 is a frozen food product such as frozen pizza and pauses in the bag maker 25 , the cold temperature of the product 13 will have very little line contact with the bag maker 25 . In addition, the space 52 formed between the product 13 and the non-contact bottom plate portion 45 is a heat-insulating space. It is difficult for the heat to be transmitted, and the decrease in the temperature of the bottom plate part 45 of the bag making machine 25 is suppressed. As a result, the temperatures of the upper and lower surfaces of the bottom plate portion 45 are prevented from significantly lowering with respect to the temperature of the surrounding atmosphere, and dew condensation is less likely to occur.

Furthermore, in the present embodiment, air is jetted toward the lower surface of the bottom plate portion 45 of the bag making machine 25. Therefore, even if the temperature of the bottom plate portion 45 drops, relatively warm air hits the bottom plate portion 45. It suppresses the temperature drop of the bottom plate part 45, further suppresses the stagnation of the air in the space below the bottom plate part 45, and causes the air flow on the lower surface side of the bottom plate part 45, thereby causing dew condensation. to more reliably prevent

Furthermore, in this embodiment, recesses 51 are provided at positions corresponding to the protrusions 50 on the lower surface of the bottom plate portion 45 (the outer bottom surface of the bag making machine 25). The concave portion 51, like the convex portion 50, is a linear concave groove extending along the transport direction. As a result, the air injected toward the bag making machine 25 is guided by the linear concave portion 51 and encouraged to flow toward the upstream side. Therefore, the effect of preventing dew condensation caused by the air flow described above is further enhanced. Furthermore, since the recess 51 is formed directly below the projection 50, the air flowing through the recess 51 efficiently hits the rear side of the projection 50 cooled by the product 13, thereby enhancing the effect of preventing dew condensation.

The convex portion 50 and the concave portion 51 are preferably formed at the same time by bending or pressing a flat plate at appropriate positions. Further, the plate thickness of the bottom plate portion 45 is made thinner than the plate thickness of the side wall portion 46 and the link plate portion 47 . By reducing the plate thickness of the bottom plate portion 45 in this way, it is possible to facilitate the formation of the projections 50 and the recesses 51 and to reduce the difference in level between the top surface of the bottom plate portion 45 and the top surface of the linking plate portion 47 . Also, the thickness of the side wall portion 46 is relatively thick, and the strength is increased.

Further, in the present embodiment, the upstream end and the downstream end of the convex portion 50 and the concave portion 51 are formed to reach the upstream edge and the downstream edge of the bottom plate portion 45, respectively. By forming the convex portions 50 over the entire length of the bottom plate portion 45 in the conveying direction, the product 13 is supported by the plurality of convex portions 50 arranged in the width direction while the product 13 passes through the bag making device 25. , the convex portion 50 of the bottom plate portion 45 can be separated from the unformed upper surface. Therefore, it is possible to prevent the temperature of the bottom plate portion 45 of the bag making machine 25 from being cooled to a large extent. In particular, when the projections 50 are arranged parallel to the conveying direction as in this embodiment, the contact resistance with respect to the packaging film 15 is reduced, and the packaging film 15 moves smoothly. Furthermore, since the upstream end and the downstream end of the space 52 between the adjacent projections 50 provided along the conveying direction are open, the air in the space 52 does not remain in the space 52 and is cooled by the product 13. It will never be done.

Furthermore, since the recess 51 is formed up to the upstream edge of the bottom plate portion 45 , the upper end of the recess 51 opens to the upstream peripheral surface of the bottom plate portion 45 . Then, the packaging film 15 moves to the upper surface side of the bottom plate portion 45 so as to wrap along the upstream peripheral surface of the bottom plate portion 45 . As a result, part of the air that has moved upstream in the recess 51 moves from the upstream opening of the recess 51 to the upper surface of the bottom plate portion 45 . Part of the air travels downstream along the upper surface of the bottom plate portion 45 . As a result, an air flow is generated in the vicinity of both the upper and lower surfaces of the bottom plate portion 45, and the decrease in the temperature of the bottom plate portion 45 can be suppressed more reliably.

In the above-described embodiment, the concave portion 51 is provided on the lower surface of the bottom plate portion 45 , but the present invention is not limited to this, and a configuration in which only the convex portion 50 is formed without providing the concave portion 51 is also possible. Even if only the protrusions 50 are formed, the products 13 are supported by the protrusions 50, and the regions between the adjacent protrusions 50 form heat insulating spaces that do not come into contact with the products 13. It suppresses the temperature drop and suppresses the occurrence of dew condensation. However, if the concave portion 51 is provided on the lower side of the convex portion 50, an air flow is generated in the portion immediately below the convex portion 50, which enhances the effect of suppressing the temperature drop. When only the convex portion 50 is formed, it may be formed integrally with the portion other than the convex portion of the bottom plate portion, or, for example, a thin rod-like member may be attached to the upper surface of a flat plate to form the convex portion. For example, a round bar, a semi-round bar, a square bar, or the like may be attached to the bottom plate portion 45 by welding or bonding to form the convex portion.

In the embodiment and modification described above, both ends of the convex portion 50 and the concave portion 51 are formed so as to reach the upstream edge and the downstream edge of the bottom plate portion 45, but one or both may be positioned so as not to reach the edge. good. However, it is more preferable to form up to the edge as in the embodiment. Further, when forming the convex portion 50 and the concave portion 51, they are formed as one piece that is continuous over the entire length. may However, it is more preferable to form continuously over the entire length as in the embodiment.

In the embodiment and modification described above, the convex portion 50 has a tapered shape at the top, but the present invention is not limited to this, and for example, it may have a shape having a side surface extending straight upward like a rectangular parallelepiped. However, if the upper end is tapered, the contact area with the product 13 can be reduced, and the lowering of the temperature of the bottom plate portion 45 can be suppressed more effectively. Furthermore, by tapering the upper end, even if dew condensation occurs, the water droplets move downward along the inclined surface, and it is possible to prevent the water droplets from remaining on the upper tip portion. The tapered shape at the upper end is not limited to a plane slope having a substantially triangular vertical cross section as in the embodiment, but may have a curved slope such as a circular or semicircular vertical cross section.

In the above-described embodiment and modifications, the projections 50 are laid out in parallel along the conveying direction. You may bend and form. However, since these modifications increase the contact area, linear ones along the conveying direction are more preferable.

In the above-described embodiments and modifications, the example using the shrink film as the packaging film has been described, but the present invention may be applied to packaging films other than the shrink film. However, if it is used for a packaging material with a thin film thickness such as a shrink film, the effect will be exhibited more appropriately.

In the above-described embodiment and modification, the packaging film 15 is intermittently conveyed, and the products 13 are temporarily stopped on the conveying line. However, if it is applied to a packaging machine that carries out intermittent transport as in the embodiment, the effect can be exhibited more appropriately.

In the above-described embodiment and modification, an example of application to a so-called reverse pillow packaging machine that supplies the packaging film from below to the bag making machine has been described. The packaging machine is not limited to this. For example, the packaging machine is a normal pillow packaging machine equipped with a bag making machine that feeds the packaging film from above the bag making machine and forms the bag so that both side edges of the packaging film are positioned on the lower side. It can be applied to various packaging machines such as a machine and a horizontal three-side seal packaging machine equipped with a bag making machine that makes bags so that both side edges of the packaging film are positioned on the side. In the case of a normal pillow packaging machine, it is preferable to blow air from the back side toward the bottom plate while avoiding the slit through which the film stacking end of the bag making machine passes.

Various aspects of the present invention have been described above using embodiments and modifications, but these embodiments and descriptions are not intended to limit the scope of the present invention, but to aid in understanding the present invention. Please note that it is provided for your convenience. The scope of the invention is not limited to the constructions or methods of manufacture explicitly described herein, but rather includes within its scope combinations of the various aspects of the invention disclosed herein. While the claimed features of the invention are identified in the appended claims, any configuration not presently specified in the claims is disclosed herein. For the sake of clarity, it is possible that such a configuration may be claimed in the future.

10: reverse pillow packaging machine 11: packaging machine body 12: film supply device 13: product 14: product conveying supply device 15: packaging film 15a: both side edges 25: bag making device 27: center sealing device 30: top sealing device 35 : Intermediate package 36 : Shrink tunnel 40 : Injection device 41 : Injection device body 42 : Piping 43 : Injection nozzle 45 : Bottom plate portion 46 : Side wall portion 50 : Convex portion 51 : Concave portion 52 : Space

Claims (7)

A bag-making device used in a packaging machine for packaging products at a temperature lower than the ambient temperature,
a bag making machine for making a belt-shaped packaging film into a tubular bag;
Injecting means for blowing air onto the outer bottom surface of the bag making machine,
A linear protrusion extending from the upstream side to the downstream side is provided on the inner bottom surface of the bag making machine ,
The convex portions are arranged at predetermined intervals in a direction intersecting the conveying direction,
A bag making apparatus, wherein the predetermined interval is narrower than the width of the product. 2. The bag making apparatus according to claim 1, wherein the convex portion is arranged parallel to the conveying direction. 3. The bag making apparatus according to claim 1, wherein the convex portion is tapered at its upper end. 4. The bag making apparatus according to any one of claims 1 to 3, wherein the outer bottom surface is provided with a concave portion at a position corresponding to the convex portion. 5. The bag making apparatus according to claim 4, wherein the recess is formed up to an upstream edge of the bag making device. The bag making apparatus according to any one of claims 1 to 5, wherein the injection means injects air toward the upstream side. a bag making apparatus according to any one of claims 1 to 6;
a film supply device for supplying the packaging film to the bag making machine;
a product conveying/supplying device arranged upstream of the bag making device and supplying the product to the bag making machine;
a sealing device disposed on the downstream side of the bag making machine for sealing both side edges of the packaging film made into a tubular bag;
A packaging machine comprising a top sealing device disposed downstream of the sealing device for sealing and cutting the packaging film in a direction crossing the conveying direction.

Images